Pre-testCh 19 &20 Acid/Base Pre-Test
Name________________________
1. Define a Bronsted acid.
2. Define pH.
3. What is the formula for the hydronium ion?
4. The pH scale goes from _____ to ______.
5. An acidic solution has a pH between ____ and ____.
6. An alkaline solution has a pH between _____ and _____.
7. What is the most basic value on the pH scale?
8. Write the reaction for the auto-ionization of water.
9. What is the ionization constant for water Kw = ________
10. If the hydroxide ion concentration is equal to 2.0 x 10-5 what is the hydronium ion concentration?
11. If the pH is equal to 4.65, what is the pOH?
12. Phenolpthaline is a chemical indicator that will turn _____________ in acid and _____________ in a base.
Determine the pH for the following:
13. [H3O+] = 1x10-5 , (14.) [H3O+] = 8.43 x 10-3
15. [ H3O+] = 3.59 x10-10 , (16) [OH-] = 2.56x10 -6
Determine the hydronium concentration when:
(17). pH = 5.3, (18). pOH = 4.7, (19) pH = 2.4 , (20) pOH = 8.56
Name the following acids
21. HNO3 22. H2CO3 23. HCl 24. HClO3
Write the correct formula for the following
25.sulfuric acid, 26. vinegar , 27. phosphoric acid, 28. Battery acid, 29. ammonia
Complete and balance the following equations.
30. HNO3 + Mg(OH)2 ---->
31. Sodium hydroxide + carbonic acid ---->
32. How many moles of sodium hydroxide are needed to neutralize 0.20 moles of HNO3 ?
33. 35.0 ml of 0.2 M NaOH is titrated with 70.0 ml of carbonic acid. What is the molarity of H2CO3?
34. How many mL of 0.25M Mg(OH)2 is needed to neutralize 35.6mL of 0.185M HCl?
35. How many milliliters of 0.20M sodium hydroxide must be added to 75 ml if 0.5 M HCl to make a neutral solution?
36. 45.5mL of 0.15M HCl is added to 39.5mL of 0.20M NaOH. What is the excess reagent?
solution?
37. What is the molarity of the excess reagent in problem #36
38. What is the pH of the resolution solution in problem 36?
Answers
1. H+ donor
2. -log[ H+ ]
3. H3O+
4) 1-14
5) 1-6.99
6) 7.01-14
7) 14 8 H2O +H2O <--> H3O+ + OH-
8. ) 1x10-14
(10) 5x10-10
(11)9.35
(12) clear, pink
13) 5.0
14) 2.07
(15) 9.45
(16) 8.41
(17) 5.01x10-6
(18) 5.01x10-10
19) 0.00398
20) 3.63x10-6
21 nitric acid, 22 carbonic acid, 23 hydrochloric acid,,24 chloric acid
25 H2SO4
26 HC2H3O2
27 H3PO4
28 H2SO4
29 NH3
30 2HNO3 + Mg(OH)2 --> Mg(NO3)2 + 2HOH
33) 0.050M
34) 13.2 mL
35) 187.5mL
36) NaOH
37) 0.0126M NaOH
38) pH = 12.1